Liquid Chemicals: Halogens - Video Tutorials & Practice Problems

Liquid Chemicals: Halogens

In this video, we're going to begin our lesson on the use of halogen as liquid chemicals for controlling microbial growth. And so halogen are really highly reactive oxidizing agents, meaning that they are capable of causing other molecules that become oxidized or lose electrons. And these hal agents can cause damage to proteins and other cell components as well. And so the halogen ones, chlorine and iodine are actually the most commonly used halogen size that are used as disinfectants to control microbial growth. And so, moving forward in our course, we're first going to talk about chlorine and then later in our course, we'll talk about iodine and so I'll see you all in our next video.

Chlorine

in this video, we're going to talk about the use of the halogen chlorine as a method to controlling microbial growth. And so chlorine is a halogen chemical that disinfects inanimate objects or non living objects when it is used appropriately. And so chlorine is generally used at really, really low concentrations because it is both toxic and corrosive at high concentrations. And in some cases chlorine can react with organic matter to form carcinogenic products or products that are able to contribute to the development of cancer. And so the use of chlorine needs to be managed appropriately and use in the correct form. Now, chlorine is readily available in multiple forms including sodium hypochlorite, which is really just a liquid of bleach. Um And this is really an inexpensive and readily available form of chlorine that you are able to buy at the grocery store. Then there's also chlorine dioxide. And chlorine dioxide is uh cielo too. And this is a less harmful form of chlorine that is used to disinfect drinking water. And so depending on the type of or the form of chlorine that you're using and the particular concentration of chlorine, it can be used to disinfect either inanimate objects, um such as you know, uh surfaces of items and things like that. But it can also be used to disinfect drinking water and therefore make the drinking water safe safer to consume. And so if we take a look at our image down below, uh at the use of the halogen chlorine as a method to controlling microbial growth. Notice on the left hand side, we're showing you sodium hypochlorite, which is really just liquid bleach. And its chemical formula is as you see here, sodium with chlorine bound to an oxygen And this is again liquid bleach. But once again, other forms of chlorine, chlorine dioxide. Cielo two can be used as well for different purposes. And so depending on the form and the concentration of chlorine, it can be used to either disinfect drinking water or it could be used to disinfect swimming pools once again at really, really low concentrations. And so that's why we've got this swimming pool here to help remind you that chlorine can be used to disinfect swimming pools. And we've also got this guy drinking some water here because the right type of chlorine can be used by water production facilities to help disinfect the drinking water that we drink. And so this year concludes our brief lesson on chlorine as a chemical method to controlling microbial growth. And we'll be able to get some practice applying these concepts as we move forward in our course. So I'll see you all in our next video.

Chlorine:

• A. Readily reacts with organics to produce potentially carcinogenic trihalomethanes.
• B. Is an effective, inexpensive, disinfectant able to destroy all types of microorganisms.
• C. Is unaffected by the presence of organic material.
• D. Is ineffective when diluted.
• E. A and B.
• F. C and D.

Iodine

in this video, we're going to begin our lesson on the use of the halogen iodine as a liquid chemical for controlling microbial growth. And so I have done is a halogen chemical that kills most microbes and is often in the form of either a tincture, which recall from our previous lesson videos is a chemical dissolved in an alcohol based solution or the iodine could be present in what is known as an iota for. And so typically the tincture form of the iodine is going to be more irritating to the skin. However, the iota for is different. And so the iota for is a combination of iodine and an organic molecule from which the iodine is slowly released. And so this slow release of the iodine allows the iota for to be less irritating to the skin than the tanker would be. And so the iota for itself can actually act as a disinfectant or as an antiseptic because once again it's not as irritating to the skin and this is all going to depend on the specific concentration. And so the use of iodine can vary depending on the form that it takes, whether it is a tincture or it is niota for as well as the specific concentration of the iodine in the solution. Now, once again, the iota for itself is not going to be as irritating. So it is non irritating specifically at low concentrations when it is used as an antiseptic to treat wounds or burns on the skin. And so notice down below, we're showing you the use of iodine specifically as an iota for uh and notice that this can be used as an antiseptic to treat wounds such as this cut here that this person has on their finger. And so this year concludes our lesson on the use of the halogen iodine as a liquid chemical to controlling microbial growth. And we'll be able to get some practice applying these concepts as we move forward in our course. So, I'll see you all in our next video

Which is true of iodine?

• A. It does not readily kill endospores.
• B. It may be used as an antiseptic or as a disinfectant.
• C. It is important to use it at the recommended dilution.
• D. It is usually found as tinctures or iodophors.
• E. All are true.

An iodophor is:

• A. A highly concentrated form of iodine in a water-alcohol solution.
• B. A 2% diluted form of iodine in a water-alcohol solution.
• C. A undiluted form of iodine.
• D. A solid form of iodine.